Damper for boiler and like furnaces



Aug. 9, 1927.

T. WILLIS DAMPER FOR Born-ER AND LIKE FURNAcEs Filed Nov. 1o. 192e 2 sneetsfsneet 2 x W fH,w..,.w.mm....H.,....HWUHH@ ltu Patented lAug.` 9,l 1927.

UNITED STATES e e 1,3638-,65f- 'f PATENT bom-flics.

l THOMAS WILLIs, yor MUMBLES, sWANsEA, .sonrieY WALES.

DAMPER Fon BoIIi-ER AND LIKE FURNACES.

Application sied November 1o, 1926,` serial mi. 147,532, and in Great Britain February io, 1526,:-

'Ihis invention relates to dampers "for boilersand vlike purposes, The object I the invention is to provide a form of, damper which will obviate the accumulation ofl hydro-carbon and other explosive gases that occurs adjacent the damper at the upper part of the flue on a4 large number of boilers. A further object of the invention is to improve the draught, and the efficiency oligthev damper.

According to the` present invention a damper iscomposed ofr a number of parts adapted to be extended fromV a compart-y ment or accommodated within the compartment', the said compartment having associated Vwith it passages for the free conduction of gases accumulating at the upper part of the flue. v Y

In the preferred embodiment of this ini vention I provide for the saidy compartment a rectilinear housing adapted to accommodate a pair of damper plates which can be y'selectively' moved out of the housing so as to be disposed one vabove the `other or so that a selected one of them is held in an inoperative position the Vsaid housing having one 'or more constantlyl open apertures to allow the draught of thel boiler shaft or chimney' to draw the gases from the ue. Y

Each damper iplate is'shaped to slide easily into and out of the housing, vand guides depend from the housing for vpositioning the damper plates. rOne of the plates is' adapted to close the lower part of the flue, and the other plate` is adapted to beinterposed between the aforementioned plate and the housing inthe upperpart ofv the flue. The plates can be selectively individually moved and each'platel can be held 'in anyVV selected position between the limitsv of its movements. For instance by utilizing Vonly the normally lower plate` the Vdraught can be split by using this plate mid-waybetween vthe housing and the base of the Hue.

vBy means of this damper, it is possible to collect the usual residue of the products vof combustion, such as flue dust ,soi as to free the main Vtlues from dust to-a large extent, f 1 l In j'order that the invention may be clearly understood and' readily carried intoeffect,

I have appended hereto two sheets of drawings somewhat diagrammatically illustrating an embodiment of same, and wherein,

is and i4, t

Y 1 ig; 1 is agview of Vthecomplete damper, which although for conveniencev of space is shownhorizontallydisposed', is normally vertically disposed Fig 2 fs across sectional view on the o'f a hollow rectilinear metal casing flanged as 70l at 2 at its upper end to' receive a cap 3 having a boss 4 through whichva pair of rods" 5 and'6 are guided. The lower end of the housing 1 is flanged as at 7, for attachment tothe upper langedfend of a rectangular'15 l` frame 8` whichiirame is formedA with `two parallelv channels 11 and 12 in each o-'vits vertical limbs to slidably support a pairof damper plates 13 andk 14. :The plate l13 is v` l `adapted to slide up and down the channel 89j 11 for the full length of the -frame 8 anch if*l necessary, into the housing 1 rwhereasfa suitable abutment on vthe frame 8 providesVK means whereby the plate 14A canv only slide between the upper edgeof the plate 13,185 (when 'the' plate 13 is in its lowerpositionV as injFig. 5) and the lupper end of the` housing 1. The. device is adapted to be' positioned within' a flue or other' passage l0 for smoke, gas or lthe like as'show'n in 90 Y v Figures 3 and 4 whereby the plates 1 3 and 14 may be manipulated to control the draft v i zthrough said flue or passage.

' The plate 13 has the rod 51 attached toits Y up '6V have connected to them respectively ak lley 15 kand-connected respectively toA weights 5 and 6. 'Byspacing'the' weights so :that

their relative positionsthey represent` the relative ositions o :t the damper plates` Them for examplegthe device is used in the "flue i 10 between Vthe lirebox and the'v stack of boiler; `as shown in llig'ures andFV 4,1 itis desirable to prevent the accumula- 110'l Hview onthe line y per end7 and the plate 14 has fthe' rodl 9a p i f attachedto-itsupper end. The rods'an'd" e operatorcan .readily deter- Y' y Vmine the position of the plates 13and`k14'.

tionof` explosive gases adjacent the topof the space 15T between the boiler and the stack iluev16, `and to this end'the housing 1 has one or more apertures 7 which, What- Y ever the positionsl .of the ,plates l'iand 141-1 'always allow a iree passage for the gases i into the flue 16. Foi-.this purposethe.ver.ti

'cal channels in the housing to receive theV Vplates 13 and 1alare provided Vwith gaps to Vallows/fthe free passage o the gases around the edges'of'the pla-tes` 13 and 111.

f @B lowering the alrite-13 to its lovverinost .b l aosition' as indicated in dotted linesin F10'.

,3, andV raising the plate 1 V into or partially` into thefhousing 1,*ilue dust can be collected above the discharge outlet 18, Yand freineved Whe`ii desired into the conduit 19.

It Will'be appreciated that the area `andv location of the line opening obtain'a'blerby the manipulation of` the plates 4l'and. 121` l. I V reageer) provides for a large scope of variation, and instead of having' one adjustable' opening, it

is possible to have two-'adjustable openings,

when it is desired to have a split draught. A .further advantagegarising out -of my invention is the saving in space7 as the housoverlapping and'v relatively yseparated 'positions, and means aiiording passagezfor gas through said frame in all positions of said lnlates'withrespect*thereto.'

e TrioMAsfvviLLis. 

